Caption: Mount St Helens, USA, satellite image. North is at top. Mount St Helens is an active volcano (2250 metres) in Washington State, USA. The large crater at the top of the volcano, and the barren area (grey) around it, were caused by a massive eruption in 1980. The surrounding forested area has been heavily logged, and the square patches show where deforestation and cultivation have taken place. There are also several lakes (blue) in the area. Image data obtained on 7 September 1999.